Click on a sign in the left area to add it to the selection. Recommended supplementary sign are shown on the right and can be added to the main sign by left click. (Note: The gray/disabled sign are selectable as well. Use at your own risk and check the results.)
When selecting very common signs and sign combinations, it should be safe to accept the tagging suggestion. However you still need to take care of some basic things like adding the right highway=* tag (if not set by the plugin) and choosing proper direction of the way for incline=*and oneway=*. You can also, check https://192-168-1-254ip.com/192-168-8-1/ this for more information.
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