1.
Click the the green clicky button, and select "Upload Images" (if it says that)
(https://i.imgur.com/VcY1Jsl.png)
2.
Browse your images and find a pic you want to upload.
You can also paste in an image url.
(https://i.imgur.com/oL1FmsR.png)
3.
When you get to the point where you have uploaded the image to imgur, click the v arrow (it's located in the upper right corner of the image you uploaded)
It gives a drop down menu. Select "Get Share Links"
(https://i.imgur.com/onDqIIO.png)
4.
Copy the BBCode (It says BBCode (Forums)). Now head back into your forum post and paste the code.
Success! This is how you add an image to your forum post, with the help from Imgur :)
If you want to preview your post to make sure you've got the image uploaded, just click the "Preview" button, located in the down right corner.
(https://i.imgur.com/VewLWc3.png)