Simple guide for inserting images in a post

Being old and lazy, I just want to:
Attach my image, copy the url to it (or copy a url of an internet image) then use

 [img]     [/img]
Or 
[center][url=http://][img width=500]http://[/img] [/url][/center]

Wish the sponsors would put things back to the way it was 3 years ago, but that won’t happen.