Installing that Google Tag Manager in shopify

[henrywu]

I want to install the Google Tag Manager into my shopify. 

Theme shopify

However, the link from Online Store>Theme :  There are unable to open for me to paste the Google Tag Manager source codes.

Can anyone help to fix it of installing that Google Tag Manager in shopify?

[amosmos]

Looks like you don't have permission to do that.

You should ask for permission from the store owner.

Amos