Display text beside price in Providence theme

Shopify Partner
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Im trying to display text beside price in providence theme. 

I updated the theme and any changes i made are gone so i have to input them again.

I followed this instruction: https://community.shopify.com/c/Shopify-Design/Display-text-beside-price-in-Supply-theme/m-p/352984

which worked, but looking back at the theme now it has changed a lot and I have tried endlessly to work this out and can't.

Can anyone help???

I need to input Excl. GST under the price.