To create or edit tags, go to Joomla backend > Components > SP Simple Portfolio > Categories. To create a new item, click on “+New”. You can also edit pre-existing tags by clicking on them. 

You will get the following options in the Add New Tag settings:

Title: Enter the name of the tag.

Alias: You can either automatically generate an alias from the title or manually enter one yourself. If you want the alias to be auto-generated, leave the field blank.