You can't upload them direct to TM.
You will need to host them on another site and provide a link to display them here.
If you aren't a member of a photo hosting site, join www.tm-img.com
You will find instructions here: https://www.tm-img.com/page/ifu

I must ask Simon (Talkmorgan) to remove his photo upload instructions - they confuse people who are not aware of the changes made when the forum was suffering with slow loading.

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW