If you have not done so yet you might want to check it out.
At the top on the navigation bar you see a link called UserCP, click the link to go to your user control panel.
Once there look for Networking then for pictures and album, click on pictures and album and then click on add album follow instruction. After adding album you’re ready to upload pictures from your computer.
Click on upload and follow instruction, once you got them uploaded you can view them by clicking on any of the pictures. When you click on picture it will enlarge and below the picture it will have a BBcode [img] or [image]. If you want to put a picture in your post just copy and paste this [img] code into your post and it will appear.
No reason to resize or mess with anything and just takes a few minutes to do.
All so the photos you see above on the home page are created from these albums you create so get to it