i was trying shopify and bought and changed a theme while i was on the free trial. i now want to move to stampr but don’t want to loose my work and want to use my changed theme.
If the theme runs on Shopify it should run on Stampr without modification. If for some reason it doesn’t just let us know and we’ll get it fixed but I have yet to come across a theme that doesn’t work! 
To get it installed just open your Stampr dashboard and navigate to Theme from the menu on the side. Then click the Add product button near the top and choose Install theme. Upload your theme and it should be available for any of your stores to use. 
Let me know if you need any help getting it activated on your store.