You have a sticker stuck on a surface and you want to take it off.
Is it correct to say "scratch the edge of the sticker until it sticks up, then pull the sticker off by the edge"?
You have a sticker stuck on a surface and you want to take it off.
Is it correct to say "scratch the edge of the sticker until it sticks up, then pull the sticker off by the edge"?
Adding to Michael Harvey's comment, you can say to either "scratch" or "pick at", since both refer to using your fingernail to pry at the lip between the surface and the object in question. Once you have a small bit of that object lifted (referred to as the edge in this example), you can then utilize your original phrase
"[and] then pull the sticker off by the edge"
to complete the sentence.
In summary, both
"Scratch the edge of the sticker until it sticks up, and then pull the sticker off by the edge"
and
"Pick at the edge of the sticker until it sticks up, and then pull the sticker off by the edge"
work in this context. It may be more common to use the first instance due to word utilization, but both work grammatically. I also added "and" to your original compound sentence to better link the two independent clauses.