Ummm...I need some help.

I have a lot of doujinshi I can give to the site, but I don't know how to pool them like it says needs to be done. Can someone tell me how to upload them?

When you say pool, are you referring to parenting them or actually making a Pool? The former is required, while the later is just useful since it gives you the "next/previous" options.

Parenting:
1) Find the post number of the first post. (It's in the link as well as under Id in statistics)
2) Copy it
3) Go to the next post in the series
4) Click Edit
5) Paste the post number in the Parent Post section.
6) Click Save changes.
7) Go to step 3, repeat.

Pool:
1) Click on Pools
2) Click on Create
3) Key in name, description, etc.
4) Click save
5) Go to your post
6) Click on Add to Pool under Options
7) Select the pool name you previously entered
8) Click Add
9) Go to next post, repeat.

Well, which would I need to add a new series of doujinshi to the site?

First of all, just make sure that they are parented. Otherwise the main directory will be flooded. You can always make a pool later, it's not that important.

I'm sorry but I don't know what either of those terms mean. ._. I'm new to the site and I have no idea how this works...

I'll explain using pictures. Let's say you uploaded this and it's the first page in your doujin: http://img170.imageshack.us/img170/9161/exampleml6.jpg

The ID for that picture is 268824, as you can clearly see.

So, next you want to upload the next page. On the upload screen: http://img410.imageshack.us/img410/1187/example2yg1.jpg

Put 268824 in the parent menu as pictured.

If you accidentally posted it without doing so, just put it here: http://img49.imageshack.us/img49/2627/example3nw1.jpg

Keep putting that number for the rest of them, too.