This mod includes a Data Pack that is required in order to use Colored Obsidian Plus pieces in Portal Frames. Below are steps to take for New Worlds, and Existing Worlds. In both instances, a message will appear about using Experimental features (if those are not already being used). This messages appears because of the Colored Obsidian Plus pieces that are allowed to be used in Portal Frames.

NEW WORLD CREATION (do not use fullscreen view):
1. Under the MORE tab, there is a button for DATA PACKS.
2. Click the DATA PACKS button and DRAG/DROP the archive file with the name custom nether portals.
3. Click YES to install the DATA PACK.
4. Click the Right arrow on the Data Pack to move it from Available to Selected.
5. Click DONE to validate the data pack installation.
6. Complete World Creation.

EXISTING WORLD:
1. Open the SAVES folder.
2. Select the Saved World to install the DATA PACK and open that folder.
3. If a datapacks folder is not already present, simply create a new folder named datapacks and open it.
4. DRAG/DROP the archive file with the name custom nether portals into the open datapacks folder.
5. Click YES to install the DATA PACK.
6. Click the Right arrow on the Data Pack to move it from Available to Selected.
7. Click DONE to validate the data pack installation.

