You can customize your message when requesting Usage Rights from a Social Profile on Instagram.
Here's how you can do it:
Click on "Looking for usage rights?" located at the bottom of the asset for which you wish to request Usage Rights.
In the text box where you initially find the default Usage Rights request, edit the message to your preference.
The right portion, where you can see the actual post, previews how your message will appear.
If you want to make this customized message your default template for future requests, click "Save as Default Message" at the top of the text box.
You'll have two options to send the message: