STEP 13 - I need help

I need to replace my digitizer, but my new one doesnt have that "connector" in the end of the cable so I can't plug in to the motherboard.

Do I need to buy a new one or I simply have to take it off the old one and glue it to the new digitizer?

I took it off, but I'm worried it won't work because it didn't came off completely.

I hope someone can give me a answer asap. Thanks