hi how do i edit the not radiojar schedule thanks

The "Schedule" extra fields group is assigned to the Schedule category. It consists of twelve, two-hour set of: the show's start and end time, the dj's avatar, the show's title and tagline as well as the show's cover image. Each set of extra fields is marked with the postfix _a, _b, _c, etc. up to _l on each extra field's alias.

If you want to edit the module itself then you need to edit the templates/radiowave/html/mod_k2_content/Schedule/default.php file.

So to add a dj show I have to open default.php

Nope,
The default.php is for editing it's look and feel.

To add/remove a show simply edit the appropriate K2 item.
In the quickstart package the items represent the days of the week.

Eg. If you want to change sth in Wednesday look for the item called "Wednesday" under the schedule category.

Can you post the editing link for wednesday as I cant see where to go

Go to Components -> K2 -> Items and search for Wednesday.
In the highly unlikely event that you have multiple items called Wednesday then use K2's filters on to sort the items by category.

Once you have located the file, click on the extrafields tab to see the schedule.