I am working on my first homebrew background. I want to give it two skills.  It seems I can only provide the player a choice OR only one choice.  How can I either provide the skills when the homebrew background is selected OR have them use two drop downs on the description page?  

On the background edit page, choose "Add a Modifier" and then grant one of the skills with that modifier. Then choose "Add a Modifier" again for the second skill. They will be automatically provided when the background is chosen, unless the character has the skill in question from another source. In that case, it will allow them to choose any skill in its place.

I don't have "add a modifier."  I have "add a skill proficiency." Is that what you mean?  That is what I have done.  it does not grant it.  It provides a single drop down box with a choice between the two I want if I listed both OR if I do that twice and add one skill to each I still get a single drop down box with whichever skill I added first.  

You're right! My bad, I didn't remember that Backgrounds is very different from the rest of the homebrew system here.

You should be choosing to add a Skill Proficiency twice. The first time, add your first skill. The second time, add the second skill.

You would only enter in multiple skills into one if you had a selection you wanted them to be able to make. Such as choosing between Insight, Deception and Persuasion. See this screenshot of a background I've made for reference:

I think I wasn't saving the whole Background between saving the skills.  It now grants the first skill and offers the single choice I want for the second.  Would be better if both were just granted, but I'll take it.