No social website export options in Premiere 2018

I don't know "what's up"!  Facebook should be there.  I don't think Instagram is an option.  It probably has something to do with connections, accounts, logins and passwords.  If you can post a screen shot of the "not available' message, I might have a better guess.

All is not lost!  In fact this should save time.  Sharing through those links inside of Premiere Elements require two processes.  First it "encodes" the video then it sends it to the site.

Using Export and Share, encode a final product in a standard format.  Then use the Facebook upload tool.  Instagram might be tougher because they have been notorious for requireing all input from a phone!   You may have to get the final video on your phone somehow.

A potential method for Instagram might be to save your files into a Google Drive or Dropbox folder, open the Instagram app on your phone, tap on the camera icon to select it, choose which location the photo/video is stored in and  select the file and post in the usual manner.

To make the uploadable video select Export and Share, Devices, Computer, HD 1080, pick a file name, pick a location and press save.