You can just embed the photos on the forum
. They need resizing first. The easiest way is in Paint in Windows 10. Just select resize - pixels (not percentage) - 650 in the top box - "save as" jpeg (to keep the original the same size). There are phone apps for resizing as well but I find them fiddly and the results and sizes not as easy to predict.
Once you've resized it - you embed it on the forum as follows:
1) At the bottom of your message box click "Go Advanced"
2) Scroll down and click on "Manage Attachments". A new smaller window opens.
3) Click on "browse" - select the resized photo from the saved location on your pc or your phone etc. Click "upload"
4) You can do that five times in that window - maximum of 5 photos on one message but you can do it another five times on a new message box.
5) When you've finished uploading, close the small window.
6) Go to the "paperclip" at the top of the message box and tap or left click on it. A drop down menu appears with your photos listed.
7) Put your cursor at the correct place in the message box (eg end of the typing part) where you want the photos to appear.
Click on "Insert All" in the drop down menu on the paperclip.
9) Text will appear in your message box
10) Click "Submit Reply" to send your message and the photos will appear in your message.
Note: If you want to insert the photos separately - eg a bit of typing then a photo, a bit more typing then a photo, you can select individual photos and insert them one at a time rather than "Insert All" - you just place the cursor where you want the photo in the message box and select the correct photo.