It'll take time no matter what software you use.
You should at least be able to install the SQL Server Management Studio (if you're running Microsoft SQL Server) and use that to write a query that'll insert your required data. This program is freely available from microsoft.
UPDATE more information:
Install the Management Studio on your own computer and connect to the database(s) on the SQL server using the Studio.
Then you should be able to run queries and add/update data in the databases as you desire using the Studio.
However, if you already have Access on your computer, it will probably be a better way to do this. The Management Studio was meant as a way to manage the databases and servers, and its query capability is only incidental. Access was meant as a way to interact with the data in databases, and so lacks management function.
UPDATE instructions for inserting data using SQL Management Studio:
First, I will assume you know SQL. If you don't know SQL you should not attempt this. I will not provide actual code you can simply copy and paste into the correct field.
Second, it will be easiest if you already have the data you need to insert entered in a table with the same basic structure as the table on the SQL server you will be updating.
With the Microsoft SQL Server Management Studio installed on your computer, you will need to authenticate to the server/database, then in the Object Explorer, expand Databases.
Select the Database you wish to update, right click and select New Query. There are no wizards here. You will be presented with a blank sheet in which to write your query.
Use an INSERT or UPDATE query to add the records from the table to the database.
NOTE: This can also be done via PowerShell, which may be better if you'll need to do this process regularly. Simply create a staging database where you enter the data you'll want to insert into the database on the server, write a powershell script and save it that imports this data into the database, and run it whenever you need to.