how to migrate from access 2013 to sql server 2008 R2

Question

hi
database in my project is access 2013 and I want to migrate it to SQL server 2008
I'm using Microsoft SQL Server Migration Assistant for Access program for migration
my problem is at migration wizard and at connect to SQL Server box
server name fied is empty so I can't connect to SQL Sever
by the way I installed SQL Server 2008 R2 and my OS is windows 8.1
How can I solve this problem?