The Toolbar at the top of the Main Window contains several buttons. The four buttons to the left are used for opening files, cutting and pasting components and printing. If you lay your mouse pointer on these, a short message will appear near the pointer, and another message will also appear on the Status Bar at the bottom of the Window, if this is in view.
The buttons in the centre are drawing tools for the various components in DRAINS. They are grouped into three sections: