how do i change subscription plans for LinkedIn

Firstly; this is an apple discussion thread so if you are looking for linkedin then try this:

https://www.linkedin.com/help/linkedin?lang=en

If you made the subscription through apple, on your phone you can follow this:

1. Open the Settings app. 
2. Tap your name, then tap Subscriptions.
3. Tap the name of the subscription that you want to change.

How to switch to a different subscription plan - Apple Support