How do I properly fit eGo Mega Silicone Cap on Tank B ??

[Sign-Man]

I purchased some silicone tank covers from Cignot for the Joye eGo Mega tank type "B" and don't know how to use them.

https://www.cignot.com/ProductDetails.asp?ProductCode=EGT-SIL-CPB

 

[Sign-Man]

Never mind... I was in contact with Cignot and I was trying to put a tank cap on a cartridge instead of a tank