On something like a tool suggestion post, I see a vote button on the top left, however, I do not see a reject button, so how do you reject something?
It also says I have 11 votes left. Is that total, or for the month, or what?
Sorry, I’ve tried doing a search for this and can’t seem to find anything on it. I’ve also went through a lot of the categories on the left and can’t find it. If someone could link me to an explanation, that would be great!
When you come across a post in Site Development > Tool Suggestions, you can offer one “vote” if you believe that suggestion should be implemented. To encourage people to not throw away votes at every idea, we have set a limit for each user based on their forum trust level. If you have 12 that is the highest any user on the forum gets to have. Votes are returned to you when topics are locked and marked as completed.
You do not have the ability to “downvote” formally. Instead, we encourage community members to formulate a thoughtful response, question, or criticism to the discussion. A rejected post is labeled at the discretion of community moderators and PG staff.
edit: I’m editing your post to correct one thing, it is not a monthly limit 
—@jonah
@KevPham correct me if I am wrong but, to add to this votes do not actually contribute to if a tool suggestion will be implemented, they are more used as a way for staff to gauge the community interest in that particular tool or suggestion. For example, requiring all password managers to be open source has a ton of votes and attention but did not get implemented.
The votes are mainly used to prioritize which threads to look at first. At that point, we read the actual comments and do our own testing and research outside of this forum as well, and that determines what is implemented.
The example you linked is a good one because it is a very popular idea purely in terms of absolute numbers, but it is also very controversial if you actually read people’s thoughts in the thread and consider how many people are against it as well. Something with a ton of votes but a 50/50 split on overall support will absolutely take longer to implement than something with like 3-4 votes but clearly has no opposition.