Can I fix my retainers at home? (photos)

I just got my retainers tighten today and I'm post to wear it only at night. So I did my usual brush my teeth and put my retainer on. I notice it was a ltitle dirt so I took it off. Then I notice this piece of mental pop off. I look over my paper with my orthdotinc and till will charge me if I go there to get it fix. I can't afford to get it fix..I have it on right now and it seem to be working. So 1 do I really need to get it fix? And 2 if I do can I just fix it at home?

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