When I look up "to spell" in Spanish, several sites says "escribir". But if someone says "No sé escribir", how do you know if this means:

1. I am not a good speller (that is, I don't know how to spell words correctly)

vs.

2. I am not a good writer (I don't have the higher-level writing skills)

Someone could be a good speller but a poor writer, or vice versa -- how would you know which meaning was intended?