There are a number of short cuts to moving around the screen within the editor.

TAB - press the tab key to move from line to line

HOME - press the HOME key to move to the command line (==>)

L # - Type L # (where # is the line # you want to move to) in the command area to move to a specific line. Be sure there is a space between L and the #.

F7 - Press the F7 (function) key to move backward within the file.

F8 - Press the F* (funtion) key to move forward within the file.