What stage are you at that you are having issues ?
One thing you might need to do is re-add or re-parse the spells on a character sheet if these were previously added before adding/configure the extension.
The basic steps are,
1. make sure you have configured a spell in the 'spell token configuration' system, see button in the bottom right of the sidebar.
2. Once in the 'spell token configuration', set up a spell by using the normal FG edit systems. Add a line to the configuration and type in a matching name for the spell and assign it an icon(optional) and a graphic from the assets. Set up its size relation to a grid square.
3. add the named spell to a character, and you should see the icon or the full spell token been shown.
4. drag spell from character sheet to a map etc..
If you are using the likes of the 5e spell token graphics from Gareth Jensen you will have to edit the 'SPELL_TOKENS_2.1.mod' definition.xml file, to change the <ruleset>5E</ruleset> to <ruleset>Any</ruleset>, save and repack. ( Or use the 7zip open archive/edit file open to have make the change. ) Once this is done you can use the 'import xml' file button on the configuration screen to import the 'B9_Spelltokens.xml' from the top of the thread to configure for this pack.
I obviously dont provide any graphics with the extension, but you can use what ever images you have to configure, or just some random ruleset token to 'test' setup a spell to check which part you have not configured.
hope this gets you along the correct path to sorting it out.

