Userform coding can find data but won't update it

I've been working on a userform that I can use to update information on my spreadsheet but have run into a stumbling block, it will find the information I'm looking for but it won't update it. I've got a seperate userform for entering the data into the spreadsheet and modified its the coding several times to get my search and update userform (different beast altogether now), but keep running into the same problem each time. I've included my file and the coding for the search and update below. I've only managed to learn enough VBA so far to work on this project, so I'm pretty sure I've missed something obvious here.

ThermalTestv2.xlsm

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Hi, LoneWolf3574,

maybe use this alternative for updating and build on it:

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Ciao,
Holger