If you have shared the links of your webmixes with your students, then those links will always take you to a page where you will have to add the webmix to see the content. However, there are two ways that you can get around this!
1) Signing up for Symbaloo PRO. By signing up for a PRO account, you will get your own domain (ex: science.symbaloo.com) which your students can search and see all of your webmixes without access to any of your account settings or preferences. You also can have your students become users under your account, and then you can keep track of when they are logging in, what webmixes you wish to be shared with them, and what webmixes they have created. For more features and pricing options, check out this link here.
2) If you don't wish to sign up for our PRO account, you can also try embedding your webmix on to a blog or website (ex: Blogster, Weebly, Google Sites). After you embed your webmix on to your blog, you can share the link with your students and they will be able to see the entire webmix and have access to all of the links without having to log in to Symbaloo. (Example Below)