On each of your posts, at the bottom right are the choices promote and boost.
Promoting pins your post as a sponsored post on everyones Esteem feed.
Boost gets you an upvote from Esteem and you choose the size of the vote by how many ESTM tokens you spend. Click boost and then drag the slider to how many tokens you want to spend. You can check how many Points/tokens you have from your profile page. I sent you 100, plus you earn some from every Esteem action you make.