In this module we are asked to change our password, and then log into Data Loader. When trying to log in, it asks for username, password and Salesforce Login URL.  I am doing this but keep getting an error message that I cannot log in.  To confirm, what is the correct Salesforce Login URL?
Any suggestions?

The webpage at https://play.vidyard.com/HGZK8sfDLMVfQTruyDaUaA might be temporarily down or it may have moved permanently to a new web address.

The webpage at https://play.vidyard.com/HGZK8sfDLMVfQTruyDaUaA might be temporarily down or it may have moved permanently to a new web address.

Since the points on some challenges are changed from 100 to 500, the related trail ( that before was completed ) appear in the list of those in progress ( from the dashboard ). I tried to take all the new challenges but doesn't log the module as completed, and consequently the trail. I knew that if you take the challenge again you don't gain the points, but I thought that at least it would mark the trail as completed.
 

Trailhead Lesson reference: https://trailhead.salesforce.com/projects/quickstart-lightning-experience-sales/steps/qs-lex-sales-4
The lesson is a carryover from a prior lesson: https://trailhead.salesforce.com/projects/quickstart-lightning-experience-sales/steps/qs-lex-sales-3

therefore the source of the record created came from the qs-lex-sales-3. I found that when I tried to submit for challenge I get the following error:
Challenge Not yet complete... here's what's wrong: 
The record was not created correctly.

This does not make sense when the prior record was created by prior lesson and now has a problem to complete the existing? The instructions show the following update to the record name: 10,000 Units (Opportunity)

1. Amount from 100,000 to 120,000
2  Close date. (to present date).
3. Stage from 10 prospecting to 100% -Closed/Won.

Appreciate feedback.
Thanks, Fred Flores 

I have done everything but I still get this error that is not helpful becauseI have done what it asks.

Challenge Not yet complete... here's what's wrong:
Either the contact object does not have a compact layout named 'Phone and Email', or it is not set as the primary compact layout

1. I created a custom object 'Contact'
2. I created custom fields of name (text), phone (phone type), mobile (phone type), and email (text type).
3. Then I made a new custom compact layout called 'Phone and Email'
4. I make 'Phone and Email' my primary compact layout

What did I do wrong?? Am I missing a step?? Please help.