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can you tell what error?

Insufficiant vest.😯😯

Guess what, you don't have 750SP to delegate, the error is telling you that :)

but I have around 800 sp buddy.

try filling smaller requests, when steem is telling you you don't have enough, there is nothing we can do

I see the problem, you are powering down, you can't delegate powered down SP

Oh! After removing power down Can I deligate?

Buddy now I have another problem.I deligate sp and the deligation time is expired but in my wallet it shows that my sp is deligated .
can you please explain me how to undeligate it.
And sorry for poor english.