Hi Steve, and welcome to the club
Pictures...... when you click on the new post button look at the top of the window that opens. You will see a paperclip icon. Click on this and a separate box pops up. At the top of this it says 'upload file from your computer'. Get the cursor flashing in this cell and click on 'browse' Use browse to find the piccie on your computer you want to upload and click on 'upload'
This will put your piccie on the post as a thumbnail at the bottom. We then right mouse click on the thumbnail, select 'open link in a new tab' and hey presto! your piccie can be seen in full size
If it tells you the file is too big to upload, use Windows own photoshop facility to shrink the piccie down to a smaller size.
It might take a while for the image to upload, but when it has it shows you the filename as an attachment in the attachment box. Then just click on 'close this window'. All done.
Hope this helps.