Every test on Devskiller will have a welcome and exit page and this can be used to provide the candidate with a little bit more information before the test and to gather some as well from the candidate at the end.
The welcoming page will appear once the candidate has received the test link. Your text will be above the 'Test Summary'.
To edit the welcome screen, click on the first section, and enter the message for the candidate.
As for the exit screen and the additional questions (If asked) will appear as below:
To edit the exit screen scroll down to the last section and select the questions you would like to add.
To delete any section, simply click the rubbish bin in the top right-hand corner of the input and the system will save any changes automatically.