Can I use this chainlink? I bought this SRAM PC1091 chain for my compact chainset and have been running it since January. In order for the chain to fit properly I cut a few links from it.
I am now getting a standard chainset, so I think I will have to add some links back on the chain. 

Can I reattach this link to my chain to make it longer? This is how I left it when I chopped it.
Yes, you can, but it leaves the chain weaker on that link. 

The SRAM chains are designed to work with a master link. If you use that one, it's not reusable, but it comes in a pack of 4, so you can open and close it a few times for cleaning.