Update content/hardware/_unlisted/kits/starter-kit-r4/datasheet/datasheet.md

Co-authored-by: Gaia Castronovo <53472903+g-castronovo@users.noreply.github.com>

Author: TaddyHC

content/hardware/_unlisted/kits/starter-kit-r4/datasheet/datasheet.md

@@ -78,7 +78,8 @@ The projects listed below represent the content available at the time of the kit
 
 <p style="text-align: justify;">
 You can follow the link below to access the official online course platform [11], where you will find the online projects with step-by-step instructions:
-<a href="https://courses.arduino.cc/starterkitr4" target="_blank">courses.arduino.cc/starterkitr4</a>.
+<a href="https://courses.arduino.cc/starterkitr4" target="_blank">courses.arduino.cc/starterkitr4</a>. 
+To access the course, users need an Arduino account.
 </p>
 
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