Here it is step by step:
1. go to "Host an image" on the bar above the chat
1a. select "File" then click choose your file and find the file you wish to upload
1b. Set "Resize image" to 800 px width (for forums)
1c. Click "Host it"
2. Copy the Image url (The last option) that is given to you
2a. Now click "Link" on the bar above the chat
2b. Post the url given to you by the previous steps
3. Repeat until you have all of your images in your post
If it all fails contact me and I will give you my e-mail and then upload them for you
Have a nice day,