How to update Helm theme

Hi All,

I am quite new to WordPress.
We have a Wordpress website developed using a theme which is derived from Helm theme. Kindly let know how we can update our custom theme / Helm theme. Samples / step by step activity chart will be of regeard help.

Thank you.

You need to be logged in using the account which purchased the item or at least have the purchase code and then ask the author