Tag pages -- a list of all posts with a specific tag on your blog -- exist by default on Tumblr and don't need to be enabled, even if you've only ever used a certain tag on one post. To make specific tag pages easier to find, set up redirects to guide your visitors to them.
Type the following address in your browser's address bar, replacing yourblog with your blog's username and yourtag with the tag to which you want to link. If the tag is made up of more than one word, replace any spaces with dashes.
Press Enter. This verifies that the page for that particular tag is indeed functioning correctly.
As of the time of publication, tags that contain certain characters, such as dashes, can break tag pages. For example, posts tagged with GIFs - kittens should be collected on a tag page with the address terminating in GIFs---kittens (with dashes where the spaces were). However, if you went to that address, you might see a "not found" error. If this happens, all you can do is go through the entirety of your blog, manually removing the tag from each post and replacing it with one that contains no special characters.
When you have the address to a functioning tag page, copy it to your clipboard.
Open the Tumblr dashboard and click the person icon.
Click Edit Appearance.
By default, this menu entry is only visible for your primary blog. To display it for secondary blogs, hover over the title of the blog until a person icon appears and then click it to unfold additional options.
Click Edit Theme.
Click Add a Page. This option is one of the last in the list of theme options, so you may have to scroll down to find it.
Click Standard Layout to unfold a drop-down menu and select the Redirect option.
Toggle the switch labeled Show a Link to This Page. This automatically adds a link to the redirect page on your blog's main page.
Type a title for your redirect page in the first text field. This title is displayed on your blog's theme as the link text. For example, if you're creating a redirect to the tag page for the my GIFs tag, you could enter "My GIFs," "GIFs I've made" or even just simply "GIFs" as the title.
Type a page address in the second text field -- keep in mind that Tumblr automatically adds your blog URL to this second field, so all you need to type is the part after the slash. This can be anything you want, including nonsensical text, but it's best to use something that'll remind you of where the redirect is going and to which tags. For example, you could use "gifs" or "mygifs."
Paste the address you copied in the first step into the third text field.
Click Save to create the redirect page and then click the arrow to return to the theme options. From there, you can create additional redirects.
To return to your dashboard, click Exit and then click the home icon from the theme options screen.
Tips & Warnings
- To display the posts on the tag page in chronological order instead of the default reverse chronological order, add "chrono" to the end of the address. For example: http://yourblog.tumblr.com/tagged/my-GIFs/chrono