I AM UNABLE TO name the link as "Trailhead" ON THE PLAYGROUND while VIEWING FROM the PC.

[Post a link to https://trailhead.salesforce.com with the name Trailhead. Enter the text: Trailhead is the fun way to learn Salesforce." ]

And unable to login from mobile to post as link.

Please help.

Best

I AM UNABLE TO name the link as "Trailhead" ON THE PLAYGROUND while VIEWING FROM the PC.

[Post a link to https://trailhead.salesforce.com with the name Trailhead. Enter the text: Trailhead is the fun way to learn Salesforce." ]

And unable to login from mobile to post as link.

Please help.

Best

I'm trying to complete the chatter section on Trailhead, and I'm getting the error "Challenge Not yet complete... here's what's wrong: 
No feed post was found that linked to the Trailhead URL.", and this doesn't make sense because I clearly posted the URL multiple times.

The criteria: Using the standard poll and link Chatter actions, create two posts to engage with the Chatter user community.
Create a poll post. Ask your users to rate their experience with Chatter and ask for feedback in comments.
Create a link post. Share a link with other users to http://developer.salesforce.com/trailhead - the best learning tool for Salesforce out there!