I think can reassign your macros from 1-6 to your f keys with alt+o.
Are you asking how to make macros because you’re shift+up entering /assist <main tank name>? There’s also %t if you didn’t know for target, so if you want to assist your target you can type /assist %t.
If you’re asking how to make macros: Here’s a primer:
https://m.youtube.com/watch?v=Wo-UWJGo4Ig
https://m.youtube.com/watch?v=Wo-UWJGo4Ig
Here’s some more advanced stuff:
https://wiki.project1999.com/Macro