There are several ways to access the CA File Master Plus ISPF Help section:
1. On any screen, with the cursor on the command line, hit PF1.
2. On any screen, with the cursor on the command line, enter "HELP" and hit enter.
3. On a screen with fields, place the cursor in that field and hit enter to go to "Field HELP"
There are navigational commands, like "LEFT" to go back, Enter to proceed to the next screen, and PF3 to exit ISPF Help.