Hello satkb,
Thank you for using Apple Support Communities. Sounds like you're experiencing issues trying to send group messages. Allow us to assist. If everyone in the group is using an iOS device or macOS device, you can use iMessages to communicate with each other in the group. Just follow these steps here: Have a group conversation in Messages on iPad - Apple Support
If people in the group are using SMS text messaging, then you'll need to set up SMS/MMS text message forwarding on your iPad. For information on how to properly set this up, click here: Forward SMS/MMS text messages from your iPhone to your Mac or iPad - Apple Support
We hope this helps you. Thank you for using Apple Support Communities. Take care.