Yes, you can. To create a signature, follow the steps below:

1. From your SMS account, click on 'Manage Items'> 'Manage Signature'.

2. Click on '+New'. A pop up opens.

3. Enter the Signature

4. Tick on the 'Active' status. If this status is unticked, the signature will be inactive to use in the SMS campaign.

5. You can find the length of the characters your signature occupies in a SMS. This will help you plan your SMS content wisely.

6. Click on 'Save'.