[Falcor]

I assume you mispelled the string prefix.

NPC Code:

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setstring client.fp,#v(strtofloat(#s(client.fp)) + ammount);

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That will add an ammount to your firepoints (assuming ammount is the variable you wish to add to the firepoints.). now as for converting the string into a variable it is simple.

NPC Code:

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variable = strtofloat(#s(client.fp));

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If this is for p2p i would suggest you use serverside triggeractions to edit a clientr. string instead of client. since client strings are easily hacked. You can use prefixed strings on non-p2p worlds. they just work like regular strings without an NPCs server (except for the obviouse server. prefix)

[edit] I have a habbit of editing my post multiple times after i post it [/edit]