How to loop through values using Power Query?

I'm not real familiar with Power Query, but I have this Workbook with Power Query working to get a couple of tables to download regarding information on Stocks (at Yahoo finance). Right now it works for Microsoft (hard coded). On one sheet I have a list of stock symbols that I'd like to use to loop through Power query so that I end up all the stocks appending their information to the 2 tables listed. In addition, as you can see on the output, that I've manually added the ticker symbol to the table. How can I get that to automatically add to the table?
Thanks for any help you can give.

I'm hoping someone can help here. I hope I put this under the right category (Excel - general).

When I try to Refresh the data, I get a pop-up that says, "Data could not be retrieved from the database. Check the database server or contact your database admin. Make sure external db is available. Am I doing something wrong?

Not so far. I'm trying all sorts of things and so far I haven't found the magic bullet. I'll keep trying and see if I get lucky.

OK - I'll keep trying, but so far it's never worked for me. If you can think of anything else, I'd appreciate it. Thanks.

Just wondering if you can think of anything else. It has never worked for me yet. Always getting the "Data could not be retrieved from the database."... error.

Unfortunately not. I deleted all rows except for the first 9 on the stock symbols tab, then went to the "Institutional" tab, went to "Data" menu, then "Refresh" and I received the same error. I then deleted all the rows but the top 10 on this sheet and tried the same thing and received the same error.

When I go to "Query", then "Edit" to bring up PQ Editor, I get the message:
"Formula.Firewall: Query 'GetInstitutional' (step 'RemoveNullRows') references other queries or steps, so it may not directly access a data source. Please rebuild this data combination.
When I expand the "Queries" frame, it shows an exclamation in a triangle next to "Query1" and "GetInstitutional" and "GetmutualFunds".
If I click on "Query1", at the top I get "Information is required about data privacy." and a continue button. I click on that button, and i get a pop-up about privacy levels. One option is a check box to Ignore Privacy levels checks for this file... I check that box and click "Save" and it refreshes - resulting in the word "null" in the center and the Exclamation point is replaced with a question mark.
I then click on "GetInstitutional" and it says "Preview is 4 days old with a refresh button next to it. I click on that and it refreshes and the exclamation point goes away.
Same for "GetMutualFunds".
Under "Other Queries (3), "Top Institutional..." had an Exclamation point, so I click on that and exclamation point goes away and then there's "Errors in GetMutualFunds" so I click on that and at the top middle is the message, "Expression.Error: The column 'URL' of the table wasn't found. Details: URL with a "Go to Error" button. I click on that button and under Applied Steps it goes to "Kept Errors".
I don't know what to do at this point.

OMG - that seemed to do it! Thank you!