Doing 32 posts isn't enough for you to rank. Activity and posts are two different things. Activities are calculated differently. You can only get 14 activity points every 2 weeks as described on the link given by the other users. As for now, you only have 28 points which is not enough for you to go to the next rank. Jr. Member needs at least 30 activity and 0 merits. But as you rank higher, you will need merits too to level up. The following rank next to Jr. Member is "Member". Which requires 60 activity and 10 merits. You will get merit if someone upvoted your post. They will give you merits if and only if, your post is helpful for them.