Help regarding 'Preview.'

[Pinkly Smooth]

Hello to everyone. So there is this image and I want to be able to erase some parts of it. How exactly do you do that in the program Preview? If not this program, which program can do this for me? Thanks in advance

 

[Ben J.]

How To Edit Images In Preview On a Mac - YouTube​

 

[Pinkly Smooth]

Thanks man! I managed to do, after trial and error. Cheers!