It's also drag and drop in the addon. If you are in the "Pet" tab of the addon, you should see 3 slots at the top that represent your current team. Below that is the list of pets. You can drag from that list into those top 3 slots. After that you can see that each pet slot also has 3 smaller ability slots next to it. You use those to set the abilities.
Once you have pets and moves setup, use the save button near the bottom of the addon and it will popup with a box that asks about saving the team and lets you type in a name. If you want to have auto load for the team, type in the name of the Tamer you want "exactly" how it is spelled punctuated. Then hit save. Then if you navigate to the "Teams" tab you should see the team there.
Alternate Method: Once you have pets and moves setup from the first paragraph, fly out to the tamer you want to use the team on. Target the tamer, then hit the save button at the bottom of the addon. The popup will appear but will already have the name field filled out for you. Save it.
If you wish to setup a team with a levelling slot, then follow the same steps in the top paragraph, but do the following also: In the pets list in the "Pet" tab, right click on a non 25 pet and select start levelling. This will add it to the queue on the right side of the addon. Now hover your mouse over the pet in the queue list and drag that to the top area. You'll notice a solid gold border around that slot. That means, the current pet in your queue will always go there. The methods for saving the team are the same.
All of that was off the top of my head, so I might have made a few mistakes, but I hope that helps.
Carry Pet Experience Reference Guide: