Hans:
To get rid of unwanted bookmarks on the toolbar at the top of your page, just right-click on them and select 'Delete'.
To change the home page (that you get to by clicking the 'Home' button to the right of the address bar), click on the button at the top right of the page ('Customise and control Slimjet'), select 'Settings' and then 'Appearance'. Switch from 'New tab page' to whatever you want to see there. (I've got
http://theanswerbank.co.uk entered there but you might, for example, want to see
https://www.bbc.co.uk/news as your home page).
Then click on 'On start-up' to choose what you want to see when you first open Slimjet. (I've got AB selected).
Then click 'Advanced' and 'Tab options'. Look for 'Go to the following page when opening a new tab' and choose what you want to see then. (I've got 'Blank page' selected)