How to rejoin device?

I’m quite newbie in ChirpStack so sorry if it’s lame question. Is it possible to change joinEUI in ChirpStack? My scenario:
I have Dragino LDS-01 sensor. I added it, it worked. But then I deleted the application. Since that I can’t add device again anymore. I can see JoinRequest with joinEUI I used earlier.
Can I set joinEUI? If it is not possible, can how can I rejoin device. Very similar scenario is with devices which was earlier in TTN and I want to move it to CS.

Could you explain why this doesn’t work?