Answer:
There are many ways to say this, but here is a good example of one.
Step-by-step explanation:
You could say:
"je ne parle pas bien français" which means "i dont speak good french"
Pronunciation: Je(jay) ne(nay) parle(par-ol) pas(pahs) bien(be-en) français(fran-sayce)
pas means negative, which means that "pas bien" essentially means "no good" so, "i dont speak no good french" or "im no good at speaking french"
I haven't done French in a while, so my knowledge is a bit rusty, but i know enough to survive for one day in France. ; )