As a blogger here myself I can answer this, Chel.
The easiest way is to put them onto the EOS server & add them from that. You need to have them on your computer.
When posting in your blog (OR on a forum post) click on the yellow square with the sun & mountains which will open up IMAGE PROPERTIES with BROWSE SERVER to the top right. Click on BROWSE SERVER. at the bottom it has CREATE NEW FOLDER so click on that & call your folder CHARLIE11 or whatever you prefer. You can then keep your images together in your own folder on the EOS server.
Click OK & you have your own folder now ready to save your photos to.
NB: To help you I have created a folder "CHARLIE11" ALREADY for you.
So you click on your folder (you can even create sub folders within your folder 
) & you'll see Upload a new file in this folder with browse underneath it, click on browse which will open the folders on your desktop. When you've chosen your photo .. oh & don't try to upload massive images, keep to max 640 x 480 pixels... click on upload & you will see the name of your picture such as the one I've put in your folder .. 'avatar result'.
To put this on your blog post you go to the EOS server as explained, find your folder, find your image, click on it (exactly the same as you'd do it in a normal post like this) & you'll see a preview. Now click on OK & you'll see it on your blog post or your forum post.
I think I've covered it! It sounds longwinded but at least you have a dedicated folder called CHARLIE11 sorted for you. See how you get on Chel.