Step 1: Press the Down arrow key until you hear the team whose guest permissions you want to edit, and then press Spacebar to open the context menu for the team.
Step 2: Press the Down arrow key until you hear “Manage team,” and press Enter. You hear: “Members tab.”
Step 3: Press the Right arrow key until you hear “Settings tab,” and press Enter.
Step 4: Press the Tab key until you hear “Guest permissions,” and press Spacebar to expand the Guest permissions section of the Settings tab.
Step 5: Press the Tab key once to move the focus to the Guest permissions section contents. Navigate between the settings in the section with the Up and Down arrow keys. To turn on a setting, press Spacebar.