If you have pictures you want to share on the forum, here are some basic instructions for Imgur.
Go to Imgur.com. Create an account, of course feeling free to use a burner Gmail.
Click on New Post. Note, you do not actual have to make a public post. Use copy and paste to paste in a picture, or select Choose Photo/Video to add a picture from your devices drive.
Once the image appears, if your basic image is small enough to post reasonably, hover your mouse over the picture. You will see three dots horizontally placed next to each other in the top right corner. Click on the dots, and then click on Get Share Links.
Click the Copy Link button next to the entry under BBCode (forums).
Paste the link to your forum post.
If your base image is gigantic, it is courteous to use a link that shrinks it to a more browser friendly size. You can do this my modifying the BBCode link, placing a lower case "L" character in front of the dot that appears before the file extension. For example, "picture.jpg" would become "pictureL.jpg", with a lower case L (l) , ie "picturel.jpg".
You can also get the smaller link by hovering over the icon in the top right of the page with your mouse, and clicking on Images on the menu that appears.
Click on the image you pasted in.
In the screen that appears, select Large Thumbnail from the Sizes selection links. Then use the copy button under the BBCode heading, and paste that link into your forum post.