How to Use a Trackpad to Sign Digital Signatures

Open “Autograph” by double-clicking the program’s icon in the “Applications” folder. Open a blank document in “TextEdit” or another text editor that supports pasted graphics. This will allow you to paste the signature directly into the text editor after creating the signature.
Click the “Autograph” icon in the top-left corner of the menu bar and select “Autograph Now.” Sign your name on the trackpad using your fingers or a stylus. The movement will be recorded and shown on the preview pad on-screen.
Press “Escape” to discard the signature and start over. If you are satisfied with your signature, press “Enter to Accept.' This finalizes the signature and automatically pastes it to your opened text editor.
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How to Troubleshoot Mac USB Issues (7 Steps)

Check that the USB device is connected to the appropriate jack. There is a USB jack in the back of most keyboards, but it often only works with a mouse.
Unplug any USB devices and wait a few moments before reconnecting them. You can often fix problems with your USB keyboard and mouse by using this method. Try restarting your computer if the malfunction persists after you reconnect the USB device.
Test your USB peripherals in another computer. If the problem exists in the second computer, you may need to have the device serviced or look for an updated version of the firmware that supports your USB item. Check the manufacturer's website for these updates.
Try different devices in the same USB port. For example, if your mouse if behaving strangely, see whether an external drive or an iPod is able to connect to the computer via that USB port.
Disconnect any USB hubs that you're using and connect each device one at a time to your computer. You need to troubleshoot the devices individually to find out whether the USB hub or the one of the devices is causing the problem. Be sure to test each peripheral with a working USB cable.
Reset the parameter random access memory (PRAM) and nonvolatile RAM (NVRAM) on your computer. Turn off your computer, then restart it and immediately press and hold the 'Command,' 'Option,' 'P' and 'R' keys on the keyboard. Release the keys after you hear the startup chime for the third time and your computer should boot normally.
Consider reinstalling the operating system after clearing your computer's hard drive. Be sure to back up all of your data before you erase the disc. You may also want to bring the computer to a Mac service center and have the logic board examined.
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How to Right

Push the bottom-right corner of the touchpad to activate the location-based right-click. The MacBook touchpad also supports multi-finger gestures; continue to the next step to do this.
Push any part of the touchpad with two fingers together to activate the multi-finger right-click. The MacBook touchpad also supports a keyboard-based right-click; continue to the next step to do this.
Push and hold the 'Control' key before clicking with one finger anywhere on the touchpad to activate the keyboard-based right-click. This right-click also works on other Mac computers that do not use the new touchpad design.
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