Instance
{{ formErrors.instance.name }}
{{ formErrors.instance.shortDescription }}
{{ formErrors.instance.description }}
Moderation & NSFW
This instance is dedicated to sensitive or NSFW content Enabling it will allow other administrators to know that you are mainly federating sensitive content.

Moreover, the NSFW checkbox on video upload will be automatically checked by default.
With Do not list or Blur thumbnails, a confirmation will be requested to watch the video.
{{ formErrors.instance.defaultNSFWPolicy }}
{{ formErrors.instance.terms }}
{{ formErrors.instance.codeOfConduct }}
Who moderates the instance? What is the policy regarding NSFW videos? Political videos? etc
{{ formErrors.instance.moderationInformation }}
You and your instance
A single person? A non profit? A company?
{{ formErrors.instance.administrator }}
To share your personal videos? To open registrations and allow people to upload what they want?
{{ formErrors.instance.creationReason }}
It's important to know for users who want to register on your instance
{{ formErrors.instance.maintenanceLifetime }}
With you own funds? With users donations? Advertising?
{{ formErrors.instance.businessModel }}
Theme & Default route
{{ formErrors.instance.defaultClientRoute }}
Signup
{{ formErrors.signup.limit }}
Users
{{ formErrors.user.videoQuota }}
{{ formErrors.user.videoQuotaDaily }}
Import
Auto-blacklist
Instance followers
Instance followings
{{ formErrors.followings.instance.autoFollowIndex.indexUrl }}
Administrator
{{ formErrors.admin.email }}
Twitter
Indicates the Twitter account for the website or platform on which the content was published.
{{ formErrors.services.twitter.username }}
Instance whitelisted by Twitter If your instance is whitelisted by Twitter, a video player will be embedded in the Twitter feed on PeerTube video share.
If the instance is not whitelisted, we use an image link card that will redirect on your PeerTube instance.

Check this checkbox, save the configuration and test with a video URL of your instance (https://example.com/videos/watch/blabla) on https://cards-dev.twitter.com/validator to see if you instance is whitelisted.
Transcoding
Transcoding enabled If you disable transcoding, many videos from your users will not work!
Allow your users to upload .mkv, .mov, .avi, .flv videos
Allow your users to upload audio files that will be merged with the preview file on upload
{{ formErrors.transcoding.threads }}
Cache Some files are not federated (previews, captions). We fetch them directly from the origin instance and cache them.
{{ formErrors.cache.previews.size }}
{{ formErrors.cache.captions.size }}
Customizations
Write directly JavaScript code.
Example: 
console.log('my instance is amazing');
{{ formErrors.instance.customizations.javascript }}
Write directly CSS code. Example:

#custom-css {{ '{' }}
  color: red;
{{ '}' }}
Prepend with #custom-css to override styles. Example:

#custom-css .logged-in-email {{ '{' }}
  color: red;
{{ '}' }}
{{ formErrors.instance.customizations.css }}
 It seems the configuration is invalid. Please search potential errors in the different tabs.