How to manually run CI job with parameters

Please look at

How to run the trial branch on several nodes in parallel

Use the rocmtest-trial label for the one of the nodes. Use rocmtest-trial-N (where N is 2, 3, 4 and so on) for other nodes. Assign unique N for each node.
Run the trial branch. The job will begin testing the first node.
Open the page of this job at Jenkins Web UI (begin from micimaster.amd.com/job/MLLibs/job/MIOpen). At that page, use the [Replay] button to run the job again. Before launching the job, change change rocmtest-trial to rocmtest-trial-2 in the Jenkinsfile. It will test the node labeled with rocmtest-trial-2.