How do I buy lightroom mobile for the year with my teacher discount

TBMK-

1) The 'Student / Teacher' All Apps plan is available from Adobe for us$19.99/month.

https://www.adobe.com/creativecloud/buy/students.html

2) The 'Photography Plan (20G)' for us$9.99/month from Adobe provides you (as an individual - no further discounts) with Lightroom for all Mobile devices and computers. This plan also includes Photoshop for desktop and iPad, and Lightroom-Classic.

$9.99 PHOTOGRAPHY PLAN (USA)

3) Apple Store has subscriptions for Lightroom (on Mobile devices only)