Hello Majorkratze,
You need to follow the following steps below on how to enable the easysocial login box module on your easyblog page.
1) Go to your backend > global configuration > template manager > enable "preview module position"
http://screen.stackideas.com/2015-03-26_1211.png
2) Go to your easyblog page and add ?tp=1 or &tp=1 on your url depending on your url sef. For example :
- domain.com/easyblog?tp=1
- domain.com/index.php?option=com_easyblog&view=latest&tp=1
3) After that you should see the details for each module position. Mine for example is "easyblog-before-header",
http://screen.stackideas.com/2015-03-26_1214.png
4) Go to your backend > extension manager > module manager > find "easysocial log box" and setting it accordingly with the module position that you obtained from step 3.
http://screen.stackideas.com/2015-03-26_1216.png
5) Publish it and finish. Here is the example on how it will be looks like,
http://screen.stackideas.com/2015-03-26_1217.png
Hope these help