Network Three and MMS settings

[milliemooboo]

Hi all

Been a nokia user for so long was gutted when three were not doing the Lumia 950xl...so went to the rainforest and bingo...one gorgeous phone in hand.....

but!

I cant send pictures. I have tried other websites for apn settings but still no good.
Anyone help please?
Three UK MMS setting. Normal text works fine!
Thank you so much