Remove object from picture

I have read the manual; I have watched I don't know how many videos, and still I cannot REMOVE OBJECT. I have tried every darn button available and still I just can't do it.

Example: You have a beautiful picture of a street but there is a darn stop sign right in the middle of the picture. I am sure that for some people removing the stop sign is a walk in the park but not for me.

Would someone, please, give this old geezer a few hints. I realise you are not here to do my homework but I think this is exactly what I need for this objective: spoon-feeding. I can do just about anything else but not REMOVE OBJECT.

Thank you, one and all, in advance.