How to make images scaled in posts?

A link to your site would help.

here is the link
https://www.desimobilez.info/

i need this image
https://i650.photobucket.com/albums/uu222/DesiMobilez/khudayakhair2.jpg
to be cropped to fix in my theme

Your site can’t be reached at the moment, so I can’t give you a size that you’ll need to crop the image down to. However, if you look in your style.css file, you may see references to #header. Look for a width and height associated with a block labeled #header. That may give you the dimensions you need.

If you’re still having problems, post back and we’ll see if we can reach your site.