Dear Simpel!
Thank you for your quick answer. I admit that I'm new in Joomla (working for 2 weeks), still I know how to publish a module in Joomla. I have been looking for the MarvikShop modules from Joomla modules, to publish them, but unfortunately I do not see any MarvikShop module there.
In admin site everything seems to be ok. I can see the MarvikShop components, make configurations, add products/groups or admin any thing like in osCommerce. Now a test product is active in my admin of MarvikShop, but its not in the frontend and I do not know, howto do that.
Obviously I'm missing something here. Could you mention the names of the MarvikShop modules those are listed in Joomla modules, please!