How to add more than one tags for content?
You already seem to have 1 field for this content type that is a term reference, whereas the corresponding taxonomy has at least 2 terms (i.e. "test" en "new").

Solution 1:

Allow "multiple" or "unlimited" values for the term reference you're already using, which is an option with the field settings of your existing term reference. Which you'll find at /admin/structure/types/manage/mycontenttype/fields/field_term_ref, assuming field_term_ref is the machine name of your term reference, and mycontenttype is the machine name of your content type.

Solution 2:

Create an additional term reference field for this content type, and add one of those 2 terms to the new field, and delete it from the term reference field you already have.

Note: Which solution to choose depends a bit on your use case:


If the terms are somehow "related", then solution 1 is what you should use. E.g.: Target audience with terms like visitors, members, editors, administrators.
If the terms are not at all "related", then go for solution 2. E.g. Topic and Target audience.