To Use KeyTips
1. In a worksheet, press and release the ALT or F10 key. The KeyTips appear over the Ribbon tabs.
For example, KeyTip 
appears under the Matrices/Tables tab.
appears under the Matrices/Tables tab.2. Press the keyboard letter or number shown inside any KeyTip icon to open that tab or command. For example, pressing P opens the Plots tab and shows the KeyTip for each command under the Plots tab.
3. Continue pressing KeyTips until you reach the specific command that you want to use. For example, to open the Insert Plot menu, press P and then press 0.
4. To hide the KeyTips, press and release the ALT or F10 key.