This is what I do - it works for me but there is probably a "better way"
On my computer i have a folder where i keep pictures
When replying to posts, scroll down to manage attachments
click on the button
another window pops ups up
there is a button that says add files
click
Browse files button - click
look for your the picture file on your computer
choose your picture
click on picture (it will appear in the grey box and a small one on bottom panel)
Bottom of box - right side- insert on line ( will have a number beside it) - click
Then Click done
Your picture should be in your post as [attatchment 1234]
Before uploading picture make sure picture not too big (pixies or something
) to reduce pixies reduce the size of your picture on your computer I use the paint programme to do this.
Any problems with my clear as mud instructions, PM me and I will take you through it when I am on my computer - not worked out how to do it when on my phone