How do you attach flairs to posts where required?

Post flair is a label or tag system that communities use to categorize submissions. Some subreddits make flair optional, while others require it as a condition of posting — any submission without flair is either rejected by AutoModerator or held in the mod queue. The mechanism and appearance of flair vary between communities; some use simple text labels, while others use colored badges with icons. On desktop, after writing your post title and body but before hitting Submit, you will see a button labeled "Add flair," "Flair," or represented by a tag icon near the bottom of the composition area. Clicking it opens a panel showing all available flair options for that community. You select the appropriate one — for example, in a gaming community you might choose the name of the relevant game, or in a finance community you might select "Investing" versus "Budgeting" — and the label is attached to your post. On mobile, the flair option appears similarly within the post composition screen, usually as a tag icon or a labeled button beneath the title field. If a community requires flair and you submit without selecting one, the automated system will often remove the post and send you a message explaining why. This happens instantly with AutoModerator. The solution is simply to go back to the post, or delete and repost, and add the required flair this time. In some communities, moderators assign flair to posts themselves, so as a poster you may not have the option to choose or may only have a limited set of choices. If you cannot find the flair option, it may be that the community has disabled user flair selection, in which case you either post without flair and wait for a moderator to assign it, or you check whether the community's rules explain their flair assignment process. The community's sidebar usually lists what each flair category means, which helps you choose correctly if multiple similar options exist.