I want to change to priority of Health app Data Sources to use Ergdata for rowing Active Energy. There is no "Change Order" button to use under Data Sources & Access

Hey there gregory142,

Thanks for reaching out to the Apple Support Communities. Just to confirm, are you following the steps below from the following resource when trying to prioritize your data sources? Manage Health data on your iPhone, iPod touch, or Apple Watch - Apple Support

Prioritize data sources

Here's how to choose the sources that Health uses first:

1. Open the Health app, then tap the Browse tab.

2. Tap a category, then tap a subcategory.

3. Scroll down, then tap Data Sources & Access.

4. Tap Edit.

5. Touch and hold the Change Order button  next to a data source, then drag it up or down in the list. 

6. To turn off a data source so that it doesn't contribute any more data for that category, tap the checkmark next to the source.

7. Tap Done.

If multiple sources contribute the same data type, then the data source at the top will take priority over other sources. Any new apps or devices that you add go to the top of the list automatically, above your iPhone or iPod touch. 

As a note, there won't be a button that specifically says "Change Order" so you'll just need to touch and hold the 3 horizontal lines shown next to the app.

If you continue to run into issues after going through the steps above, we'd recommend reaching out to Apple Support directly from this link here: Get Support - Apple

Take care!