Yes you must register it with Zagg. You should have the box you purchased it in. Register it, then put in a claim. There is a shipping and handling fee of $6.99 or so. You then send back the broken screen and they don't charge you. No limit on replacements. Btw I cracked mine the very first day! Uhh
Same thing happened to me. Brand new and just 4 days later it's cracked in the corner as well.
They gave me a new one no problem.
I purchased the glass curve elite Invisible Shield...states : if it gets worn or damaged it will be replaced as long as you own the device
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