Change the service you actually want
For written same-language captions, begin with the receiver’s subtitle options and the labels described in its manual. For spoken translated subtitles, use the audio options. Check the selected programme too: an option assigned a language code does not create a text track or description that the programme does not contain.
For an illustrative comparison, a viewer may turn on captions successfully but still hear no spoken text. That result is compatible with changing only the subtitle menu. Conversely, unexpected synthetic speech can follow an audio-track selection while the written caption setting remains unchanged. Describe those two observations separately.
Keep receiver and Areena instructions apart
Yle Areena has player controls for text and audio rather than a universal requirement to copy the broadcast receiver’s coded-language setting. Yle’s accessibility page also distinguishes recorded Areena spoken text using mobile screen readers from the controls available on live streams.
Before changing a shared receiver, note its existing audio and caption selections so the intended configuration is understandable afterwards. If the result is unexpected, report the channel, programme, receiver and actual menu label. The useful question is which service that selection activates on this route, not whether the viewer understands Dutch or whether the programme originated in the Netherlands.