Mixamo animation to metaHuman question

I created a metahuman in 5.3 or 5.4, imported it in 5.5 (after changes), it is in A-pose . I want to animate it, so got to Mixamo, downloaded a character (in T-pose), used that to import animations according several video’s I watched. I created IK_Rigs for both Mixamo character and metahuman body, again, following documentation and videos, and created an IK-retargeter asset, from Mixamo to Metahuman. It works fine except: How do I change the pose from the metahuman from A to T? I cannot locate where I can change the pose - as desribed in all video’s, I’ve seen there is a plugin for it but it could be done in Unreal too - according the (pre-5.5) viddeos - so how to do that now