You can manage your bot's login status two ways: through the MoonBots HUD in Second Life or through the MoonBots website. Both do the same thing, so use whichever is easier for you!
Before you can use the login controls, you need to make sure the right bot is selected on your HUD.
Select your bot:
You will see three buttons at the bottom of the Advanced panel: Log In, Restart, and Logout.


The Log In button brings your bot online in Second Life.
Use this when your bot is offline, and you want to log it back in.
After clicking Log In, give it a few minutes. The bot needs time to fully load its appearance and Upsies! settings before everything looks right.

The Restart button logs the bot out and back in again automatically.
Use this when your bot is already online, but something seems off, like it is not responding, acting stuck, or not picking up changes you made.
A full restart can take up to 3 minutes, so give it a little time before checking on it.

The Logout button takes your bot offline.
Use this when you want to log the bot out of Second Life. It will stay offline until you log it back in using the Log In button.

You can do the same things from the MoonBots website, which is handy if you are not in-world.

The same rules apply: logging in takes a few minutes to fully load, and a restart can take up to 3 minutes to complete.