Hello Radek,

Go to Step 1 Settings > General and click on the icon highlighted below:

This will open the Language Content Management screen.  The two variables which you need to edit are cart_provisional_amount and cart_order_summary (the latter is shown below):

Change the existing value by double-clicking on the field to the right of the variable name, then entering your own text.  Close the Language Content Management screen when finished, then reupload your project to the server in Step 5.

Clear your browser cache before testing.

Kind regards,

Paul

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My apologies, Radek...  I've just noticed there were another two variables circled in your screenshot.

These should be:

cart_proceedtoorder

and

cart_article