How to reflect custom content type on the authoring page?

Summary:

Created a custom content type in my Infosys instance of B2B service KM but unable to see it while creating the articles.

Content (required):

Full pathway of creating content type and make it visible and usable for everyone while creating article.

What are the important jobs to be run regarding that?

What are the possibilities and reasons behind this?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):