Open a free account somewhere, to host the pics you want to post. I just switched to postimg.cc because Photobucket started charging large fees.

https://postimg.cc/

Once you've created an account, make folders to manage your pics. (GIFs, Hunting, Family, etc.). Bookmark that folders page, so it goes right where you need it to decide what you're going to do.
I only have three folders so far;

Click the folder you want to use, which will bring up the Upload page. Click Choose Images, to browse for/select the pics you want to put in there, then click Upload.

Once that's done, you'll get a screen with different options. You can upload more, go to that folder, Home, etc. I clicked the name of the folder I'm using for this tutorial (Help Files), so I could access all the screen caps I'm using here.

Choose the pic you want to use, then hover the cursor over it. Click on the Share symbol, which will bring up a list.

On that list, click the icon for Hotlink To Forums, which will copy the url, then click Close.

Once all of that is done, start your thread here (or wherever), and when you have the cursor exactly where you want the pic, hold down Control and press V. (Just once; if you hit it more times, or hold it down, it'll keep Pasting the url over and over).