A post engagement campaign is created for one sole purpose and that is to get more engagement from targeted people. This objective should only be used for this reason only.
1~ Open the creation tool
Here -> https://thecampaignmaker.com/app/createcampaign
2~ Name your campaign
Only you would see the campaign name.
3~ Choose your ad account
This tells Facebook which account to charge for the ads.
4~ Choose Objective
Choose “Post Engagement” as the objective.
5~ Facebook page & Post
Choose the Facebook page you want associated with your ad.
Next choose the post you want to promote from the drop down.
6~ Preview how your ad will look like!