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In the forms to add/edit a post, you'll see a post title field added in the form editor, by default.
( example screenshot: default-post-title-field.png )
Even if that post title field has been removed from the form editor, you can add it back from the fields in the 'Post elements' section.
( example screenshot: post-title-field-post-elements.png )
I hope this helps and please let me know if you need further assistance.
When adding/editing a post through the regular WordPress post edit screen, there is a default post title field available on the top.
In case, you're not seeing the post title field on any particular custom post type's edit screen, please check its settings at WP Admin -> Toolset -> Post Types and make sure that the 'Title' option is enabled.
( example screenshot attached )