If you mean after you've spread composted material over the soil, no, don't cover it.

I would if it is on open ground such as the veggie garden. Dig it in.

Oh, well yes, I;d dig it in for a veggie garden (though I wouldn't bother for ornamental planting), but I assumed Tojan was asking if he should cover it with a tarpaulin or something...

Ah, I had not thought of that option :-))

I was looking to put a membrane over once I had manured
and dug in then is it cover or not

No cover, not necessary