1. The problem statement, all variables and given/known data
Hi there, I am kind of new to this site, so please bear with me. On the more advanced physics forum page, there was a question about dipole moments, and the way the help had been described was a bit over my head. I am posting this for clarification purposes because this is something that we have recently talked about in class. I will just use satchmo05's problem so I can see the relevance to the more advanced help:

I understand how to find the magnitude thanks to nickjer's help, but I still do not understand how to find the direction of this problem.

3. The attempt at a solution

The magnitude makes sense to me. In order to have no radial component to match up with the z-axis aligned E-field, the theta angle in the E equation needs to be 90 degrees. I got lost when they started talking about the phi angle. Can someone please simplify this down for me so that a beginner like me can understand this? Thank you for all help included in this post!