General Q&A note
Help us all to help you.
Please give full screenshots with any questions. With the relevant panels open.
This can be done by Blender itself, via the ‘Window’ menu bar top left-hand side.
On that menu dropdown is ‘save screenshot’.
Also, include the lecture time and name/number that is relevant to the problem/issue.
Check also the ask forum, because it’s a common problem.
Or see the wiki: WIKI - Interesting forum topics, problem solving issues