Software to photo composite overlay?

I'm tired of gimp and its crony features to add a image into a image i could not even paste the cutout figure into the other image it didn't give me the option to right click on the secondary image. I want to cut and paste a piece of wall art into another photo (living area) i wish i had my iPhone because i had apps to over lay and composite. I have macbook air.

What can I do in this situation?

My screen cracked so I took it in to get fixed. It came back with the screen all green and home button loose s it's overheating ater a minute of use. Took it back then ordered a new screen and put that on. The colors a little better but the problems are the same, except now there's like a white light on the very top of my iPhone. They said it's internal damage and that they can't do anything about it, but my phone was perfectly fine before I even took it to another shop and they agreed.Looked online and saw that it's probably the camera sensor flex. What do I do I don't wanna pay another 160$. ALSO the new screen has like a tiny hair in it and he scratched up my phone

My iPhone speaker is not functioning right?

My iPhone speakers will not make any noise when i try to watch a video, listen some music, or even make that click sound when you type or when you turn it off. It does make the ringtone sound though, so i don't know what could be the problem. Can anyone help me out with this issue?

P.S: for some reason when i plug in my iPhone charger core into the Iphone port, it spills some type of black ink onto my charging cable