Welcome to VBAX Ella63112. Can you upload a file to explain which column on which sheet matches what value etc.

At this stage you have stated you would like
a) Find a First Match in Column C on another sheet,
b) If Found then add 1 to Column M value, and then
c) if Column M.Value then matches Column P Value, then
d) move to the next match in Column C.

However, you also want (as written),
e) If I find a Match and Add 1 to Column M Value you want the macro to stop....

Then to complicate it a little further,
f) If all the Matches produce a matched value between Columns P & M, I still want to add 1 to the First Match.

Seriously a sample workbook would be extremely helpful.