Update Operational_Instructions/Submission_Instructions.md

Operational_Instructions/Submission_Instructions.md

@@ -9,6 +9,7 @@ We use the HuggingFace Competition submission mechanism:
 7. To view your submission information, click "Cancel" in the pop-up window and then click "My submission" in the left rail\
   7.1 The submission "Status" shows "Success" if your Answer file is a valid JSONL file and all Answers are valid (i.e., comply with the [Answer schema](Answer.json.schema))\
   7.2 In case the submission "Status" shows "Success", the "Public score" shows "Number_of_valid_answers" which is the number of valid Answers included in the submitted Answer file (not an actual scoring)
-8. You may submit up to 5 Answer files, and optionally select the one you'd like to be evaluated by checking its “Selected” box in the “My submission” tab
+8. You may submit up to 5 Answer files, and optionally select the one you'd like to be evaluated by checking its “Selected” box in the “My submission” tab\
+  8.1 You may change the selected submission and then click the green "Update Selected Submissions" button
 9. The evaluated Answer file will be the last selected valid submission made before the session end time. In case no selected valid submission is made before session end time, we’ll evaluate the last valid submission made in time
 10. We accept partial submissions where not all questions are answered due to time limitation or any other reason