what are the steps to change Innodb_page_size?

It does need to do anything with a new install. There are steps to follow if you want to change the size. These are:

• Firstly, go through your data and export it by moving it or by deleting the database and folders.
• When it is done, fixed innobd_page_size to any of the 4k or 8k
• After that, restart the MariaDB.
• When it is on, there appears a new XtraDB but having smaller page size.
• Now you are free to introduce your data and do what you want to do.

So, in this whole procedure, you don't need to do anything with the new installment.