Looking for logging into the Salesforce1 site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Salesforce1 site. After that you can login as usual with your login credentials.
https://login.salesforce.com/
https://success.salesforce.com/answers%3Fid%3D90630000000CiQQAA0
https://partners.salesforce.com/s/education/general/Salesforce1
https://salesforce.stackexchange.com/questions/165187/not-able-to-login-to-salesforce-1-mobile-app
https://salesforce.stackexchange.com/questions/22286/why-cant-i-log-in-to-the-salesforce1-android-app-with-a-dev-account
https://salesforce.stackexchange.com/questions/165187/not-able-to-login-to-salesforce-1-mobile-app%3Frq%3D1
https://www.uplabs.com/posts/salesforce1-login-signup
http://www.nuageexperts.com/blog/enable-salesforce1-for-your-partner-community-users-in-3-simple-steps-1
https://communities.bmc.com/docs/DOC-52492
https://books.google.com.tr/books?id=CY52BgAAQBAJ&pg=PA17&lpg=PA17&dq=salesforce1+login
https://theaccidentaladmins.com/loginsf1otheruser
https://books.google.com.tr/books?id=mLkrDwAAQBAJ&pg=PA330&lpg=PA330&dq=salesforce1+login
https://play.google.com/store/apps/details%3Fid%3Dcom.salesforce.chatter%26hl%3Den_US