How to Change the Size of a Slide on Keynote

Open a new or existing Keynote presentation.
Click on the blue 'Inspector' button in the toolbar. Click the 'Document' pane then click the 'Document' button.
Click the 'Slide size' pull-down menu at the bottom of the window. Select the desired slide size from the pre-sets or click 'Custom Slide Size' to enter the desired width and height in pixels. Click 'OK' to confirm the size.
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How to Replace Video Cards on a Mac (7 Steps)

Power off the Mac Pro computer and unplug the power cord.
Remove the side cover by lifting the lever on the back of the case.
Pull out the existing video card.
Insert the new video card in the same location.
Connect any auxiliary power connectors to the video card. In most cases, this is an adapter that converts from the standard molex connector type to PCI-E.
Replace the side cover and power on the computer.
Optionally install the latest drivers for the video card. Visit the video card manufacturer's website to obtain the latest driver software. The video card works without the update, however.
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How to Buy RAM for a MacBook

Assess the applications and programs that you are going to run and the amount of RAM required for it. Applications having graphics and multimedia require more RAM and, without it, can often reduce the speed of your machine.
Check the existing configuration of RAM on your MacBook. For this, go to the 'Apple' menu and select 'About This Mac' to get the memory report. Also refer to the pie chart that is provided. Remember, yellow and red indicate the need to increase the amount of RAM.
Discover the maximum RAM configuration that your MacBook can support. For example, a MacBook 1.83 GHz has a fixed memory of 512 MB size and can support up to 2 GB of RAM. Similarly, a MacBook of 2 GHz has a fixed memory of 1 GB size and can support RAM up to a maximum of 2 GB.
Log on to the Apple Web site and note the specifications of MacBook. Determine your exact RAM requirement. Find out about the need to buy RAM through the OS X's Activity Monitor.
Contact Apple or other dealers that sell RAM for MacBook. It is always recommended to buy RAM from the manufacturer of MacBook so it won't cause kernel problems.
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How to Create an Emailing List in Apple Contacts

Open the Contacts app on your Mac. Click the “View” menu item and select “Show Groups” to display your existing contact groups.
Click “File” and then select “New Group” to create a new untitled group in the Groups pane of the Contacts application.
Click the title of the new group to edit its title. Name the group based on how you associate its contacts to one another; for example, a group for book club members could be titled “Book Club,” while a group for co-workers could be titled 'Work Contacts.'
Click the “All Contacts” item in the Contacts pane. Scroll through the list of contacts and drag entries into the new group. Hold the “Command” key to select multiple entries and then drag them over.
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