You can also pin the learning path to the learning portal directly in the learning path edit
You can always add a new learning path to your preferred learning portal under the Community tab. Even if there is only one learning portal for your organization, you still need to make the attachment.
Once you have selected a learning portal, select the Learning paths tab and from there Add. The list will only show learning learning paths that were not yet added to the learning portal. Select the desired learning path and press Add selected.
You can also attach a learning path to a community directly from the Learning section of the learning path. Click on the Communities button in the learning path and then click on Add to add the learning path to the communities of your choice.