Tips:

• Dev Kit:
  
• Don't click the 'compile' button. That's for game devs. Instead, only use the 'conan exiles' button to build/cook your mod.
• Finding assets to adjust for your goals:
• bonus encumbrance per point is in BP_AttributeSystem which is an actor component that gets attached to each player pawn. You can either edit the attribute system directly (causing potential mod conflicts and having to redo it when the game updates), or you can attach your own actor component to player pawns that gets the attribute system in begin play and tweaks the value (more involved, more robust solution)
• ACs can talk to other ACs attached to the same thing via GetOwner -> GetComponentByClass, or you could do GetOwner -> Cast to BasePlayerChar -> GetAttributeSystem