How to reset a home page , open safari & its preferences > click on general . type top sites in new windows open with & same in new tabs open with , then click on set to current page .
An article : Safari for Mac: Set your homepage in Safari
As you are preferring top sites and in my screen shot I use homepage .

An how to enter in user library :
Take cursor on top menu bar click on go , just scroll down then again click on go to folder .

And type ~/Library in the pop - up window .Then click on go .

Another method to enter user library :
Click on finder > Hold option key & don't release it , click on go in top menu bar , library will be seen in the same column ( just below computer ) .So click on library - you will enter in user library .
Make sure to enter in user library only finder must be open & close all applications by pressing command + Tab + Q .