To add the upsell to your course, go to your course settings, click on the Access tab and on the Gear behind Digistore24. There you jump to the subitem Upsells. At this point you can click on the button Add Upsell. Now define your first upsell by selecting the corresponding landing page that is linked to your desired upsell. Two new buttons will then appear: Upsell and Downsell.
Therefor a short example:
Someone buys your initial course and during the checkout process is offered your upsell product that you just linked (for example, a 1:1 coaching).
Should the user say yes to this offer, you could suggest him another product by adding a second upsell (click "+Upsell").
If the user decides against your first upsell product (in this example your 1:1 coaching), you can offer him a downsell instead (e.g. a PDF guide or an eBook - click on "+downsell").
When you create upsells and downsells, keep in mind that it's not just about increasing your own sales, but also about increasing customer value. The products you offer should generate value for the buyer and be relevant - otherwise a negative image of "selling at any price" will quickly emerge.
Once you have set your upsell/s/downsell/s, click on "Save Upsells".
Now when you look at your upsell page, you can see that nothing has changed on your page. What happened in the background? The difference will be visible when the buyer purchases the initial product. To do this, simply place a test order for your initial product (you can find out how this works here). When you make the test payment, you will be redirected to the linked upsell page - during the order process the customer will be offered another product (e.g. your 1:1 coaching).
Coachy recognizes that the page visitor is in an ongoing order process and displays not only the "Yes, I want that" button, but also the option to click on the "No, I don't want" link (cancel link). If the upsell page had been accessed by a brand new visitor who had not previously purchased the initial product set (for example, your course), the "No, I don't want" link would not be displayed at all.
Of course, you can also change the text of the cancel link by editing the corresponding landing page. Under the Options tab, you will find the Upsells item at the bottom of the page, where you can enter an alternative text for the link.
Don't forget to save your changes!