Hi,
Here was your redacted message for reference:
When i login as "Πελάτες" i need to see both prices.
When i login as "Guest" i need to see the second price only which is the retail price.
When i m not logged in i need to see a third different price.
So, right now group "Πελάτες" can see only the first price, but if i click on the product i see 2 prices but the second price has no title.
If i login as Guest i see the correct price but the price title is the same for all.
How can i fix that?
The price title of the group "Πελάτες" must be "Τιμή Χονδρικής"
The price title of the group "Guest" must be "Τιμή Λιανικής"
And the third price title must be "Τιμή"
Again, all what you're describing seems to be correct. HikaShop display the correct prices for each user group.
Your problem is apparently with the "price title", but there is no "price title" in HikaShop.
HikaShop doesn't display any "price title" for prices by default.
So this means that this has been added on your end, with some kind of customization or by your template provider.
So displaying different price title for each price will require further customization of the file "listing_price" of the view "product" via the menu Display>Views. You'll have to add your custom code after the line:
foreach($this->row->prices as $k => $price){
in that view file.
Please understand that this is outside user support and falls into the custom development category. Please contact a third party developer if you need someone to work on that for you.