Where is it saying it's too big?

If you are trying to upload a photo into your gallery it should be OK, though if you've got a lot of stuff already there you may have filled your allocated space allowance so will have to delete something else to make room.

If you're trying to load it for your avatar, then the permitted file size is a lot smaller: a maximum of 120x120 pixels or 19.5 KB - whichever is the smaller of the two.

If it's something else then you need to give some more information.

HTH,
Rosemary