When you import trades or enter a trade through the journal popup, a new instrument will be created in the instrument settings.
The settings allow you to manage those instruments. You can edit and rename instruments. You can also add new instruments here directly.
Add an instrument
Just enter the new instrument name (1) and then confirm by clicking the green button (2).
You do not have to add new instruments here. A new instrument will be added automatically when you enter a new trade too.
You can disable certain instruments in the settings table by unticking the "Active" tickbox.
You can not delete instruments and only disable them.
You can show/hide disable instruments by ticking/unticking the checkbox on the top right.