Marelis did you try Jim's instructions for uploading to flickr? It worked for me but I haven't tried it lately.
1. Log into Flickr
2. Click on the photo you want to share.
3. In the bottom right corner of the screen, there is a curved arrow to the right. If you hover your mouse over it, a text box will pop up that says "Share Photo." Click on the arrow.
4. In the resulting pop-up window it will say "Share 1 Photo To" and shows icons for popular sites like Facebook and Pinterest. Above that, tabs list "Share" "Embed" "Email" and "BBCode". Click on the one that says BBCode.
5. When you click on BBCode, select appropriate size. A whole bunch of text shows up in the text area. Copy all that text.
6. Log into this forum and start a post, paste the text you copied from Flickr into your post. Your photo won't show up until after you post it.
7. To insert a photo without extra links shave off text per example below....
The example is no longer available here but you may want to delete your last name from the code they give you. Jim can explain it better than I can.