You can use the Hashtag Manager available in Comity to create hashtag groups and easily add them to your posts using the "Hashtag Picker" available in the post editor.
Managing Hashtag Groups
Click the account menu and select Preferences.
ย Find the hashtag groups section and click "Add Hashtags"
Create a new hashtag group and save.
Look for the # icon in the post editor. You can attach your hashtags with just a click to your posts.