There are few options. You may subscribe via
a) SMS – Send subscription code of their package choice to 23388 or 22111
b) USSD Easy Menu – Dial *150# to subscribe/activate their package choice
c) Self-care portal – selfcare.xox.com.my
d) MyXOX App – Available on Google Play store and Apple AppStore
Subscription code: Please refer to Q1 for reference.