Thank you for the question, and good eye noticing the red line through the https address. The red line through the https simply means the site does not fully comply with encryption required in order for the browser to deem the web site to be trusted. You can click on the red line for details, but those details do not fully equip you with the information needed to determine whether the site should be trusted. The bot***** *****ne is that you should not trust the web site if it has a red line through it. In many cases, the author of the site has done something wrong and is not aware of the problem. But this means your data is not encrypted and anyone who is involved in malicious activity on that web site can see your data being passed to the web site (ie - your name, credit card, etc...).
In many cases, the problem could be related to an expired security certificate on the web site, but whatever the case, the site you are visiting is unsecure and you're taking a gamble by passing your information to them. I hope this helps, but please let me know if you have any questions and I will be happy to assist further. Thanks again!