The article only applies if your account was created before 5/4/20
To change the plan you are on, log in at my.unrealmobile.com and click on PLANS.
Next, select the plan you would like to switch to. Click the green, SELECT PLAN button.
Finally, click "CONFIRM" to process the switch.
You will be charged a prorated amount and you'll receive a prorated amount of LTE data. When your billing cycle renews, you'll incur the full charge for your new plan, and receive the full allotment of LTE data.