How do I delete Facebook messages from messenger on iPad air I cannot find actions icon

To backup all your Facebook Messenger conversations, follow these steps:

1. Open the Facebook Messenger app on your smartphone or tablet.
2. Tap on your profile picture or the three-line icon in the top left corner.
3. Select "Settings".
4. Scroll down and select "Privacy".
5. Tap on "Download Your Information".
6. Select the categories of data you want to download. To backup all your Messenger conversations, make sure to select "Messages".
7. Choose the date range and file format for your download.
8. Tap on "Create File" and wait for Facebook to prepare your backup.
9. Once your backup is ready, you will receive a notification in Messenger and via email.
10. Download your backup file and save it to a secure location.

It's important to note that downloading your Facebook data and Messenger conversations will include all of your conversations, including deleted messages.

There are possible ways on how to retrieve those deleted Facebook Albums. In times like this, you need a professional program to help you get those important conversations back. The easiest and fastest way to retrieve those deleted Facebook Albums is through third-party software. FoneDog - iOS Data Recovery is the world's leading iOS recovery program that has helped millions of users around the globe. It has the highest retrieval rate in the industry and works with all iOS devices such as iPhone, iPad and iPod Touch. To begin the deleted Facebook Albums recovery, follow the simple steps below:
Option 1.The three-party application for restoring deleted messages
Step1. Run FoneDog - iOS Data Recovery after download and installation

Step2. Click "Recover from iOS Device" from the left-side panel tool options
Step3. Scan and Recover Facebook messages from iPhone Completely
More refer:
How Do You Retrieve Accidentally Deleted Text Messages from iPhone 7 or iCloud Backup
How to Recover Deleted Viber Messages from iPhone 7/ 7 Plus
Hope it can help you sooner

If you find the Facebook icon, tap and hold down on the icon until it starts to jiggle around. Then tap the little 'x' on the top left corner of the Facebook icon. A message should appear asking you if you want to delete Facebook. Press delete.

You may have to do a factory restore go to apple.com and go to support! You can also delete the Facebook application you have to delete Facebook messenger as well as facebook

In messenger? Phone, cp, tablet?

Messages can be deleted by first navigating to message by clicking the messages icon at the top of Facebook and clicking "See All".

You can then click the little X by the message to delete it.

Or alternativly select the message and then click on "Actions" and then choosing the option you want to take as either Archive or Delete.

If you are talking about facebook messenger you just need to hold down your finger on top of the icon, wait for it to shake and a little 'x' button to appear on the app icon, then click the 'x' button. If you are speaking of the Messages app for the iPad, I'm sorry but that can never be deleted. Hope this helped!