The sun is not automatically included in the list of targets for safety reasons. You need to set it up first. Here are some instructions, yours may be similar
“Note that to include the Sun in the list, you must first access the Menu button (UNDO back to the “Press ENTER to begin alignment” prompt), select Utilities and then Sun Menu. This is a one-time setting and will be stored for future use. ”
Dont forget to keep the main scope and finderscope covers on of course !