When you start using Metatask, it shows you tooltips to help understand the system better. E.g. when you place the cursor on some button, the tooltip explains how the button works.
If you need to disable tooltips, please open the account drop down menu and click "Profile settings" option. Choose tab "General settings".
When you uncheck the "Show help tooltips" checkbox, Metatask stops showing help tooltips. If you'd like to get them back, check it again.