1st Step: Go on your back office Bsport, click on settings > Widget > choose your calendar > copy the link.

2nd Step: Shorten the copied URL.

Indeed, Instagram does not support heavy links, so it must be shortened.

To do this, open a web page and search for: bitly.com

Paste your URL in the following bar, and press "Shorten".

3rd Step: Insert this link on Instagram.

Copy the link generated by bitly.com. Go to your Instagram account > Profile > Edit Profile > Paste the link into "Website" or "Bio".