3 way 2 gang new wireless switch help please

[Josephineyy]

Stuck here

 

[SUNRAY]

The exisiting landing switch already has one upstairs and one down stair switch.
I am trying to make the new wireless switch a third control for this light.

That is something which is impractical to do, going back to this:

Are you trying to replace the existing landing switch with that in the picture, if so you will simply need to buy a single gang wireless version to replace the downstairs switch and program both to the receiver. Or 2 additional remote switches to replace both existing switches.

Is how kinetic are designed to operate

That will render the existing switch wiring redundant.

Then all 3 switches are paired with the receiver.

Stuck here

It is somewhat difficult to see the wiring in your photos due to lack of light but it appears to be regular 'loop-in at the rose'. As above it is impractical to retain the 2 existing switches and wiring as Kinetic switches are not designed as 2way or to interface with existing 2 way switching, as Eric mentioned a relay could be added into the mix which will entail additional cabling and fiddly wiring.
To be honest, I wouldn't be comfortable trying to talk you through all of that.