Unless the job has anything to do with computers, the "computer skills" question is just an open ended question to gather information. The management may use it for data mining to find people that know some computer skill they suddenly need urgently and/or don't want to go out to the market place to hire for the specific job.
For example, you're a small company of 20 people. You find yourself in need of a database and small application to track some business operation thing. You don't want to buy a product (or none is available) and the job is much too small to hire in a professional. You look at your people, and the applications they submitted, and you notice somebody wrote MS Access. Now, you have someone to go talk to and see if the job is something they could do, and if their skills are sufficient enough to do what you need. As the business manager (or owner), you might get lucky and they have the skill you need.
The scenario above happens in large corporations too. For example, a corporation may have many client teams. And, each client team may have a dozen or more operation teams (for specific functions in support of the client). And, there would be an IT organization. The Operation teams don't always like to go to the IT Organization for help. Rather, the people in the Operation team know their work better than anyone else, so if they can do something small and "in house" they sometimes prefer this option.
The type of things you put down in that box should just be about what you know. If you've never touched a computer (which is impossible since you posted here), then you should say "None". If the job is unrelated to computers, that will not hurt your chances. If you know stuff, then put what you know. For example, you might say mention the operating system (iOS or Windows or if you really know more than the general public, then IBM 30xx, Solaris, etc), Internet, MS Office Products (e.g. Excel, Word, Access, Powerpoint, OneNote, Project, Outlook, Visio, etc), and database tools you know (e.g. SQL Server, Oracle), any firewall management and DNS redirect stuff you might have handled, or any IT Security things you've done, etc....
Note, that if you're a programmer, you would just write See Resume. Because, nobody that asks this general question is interested that you know things like HPSC, ITSP, HPQC, SSIS or DTS Packages (Data Transformational Services), T-SQL (DDL and DML), SQL Profiler, Java, Javascrpt, HTML, SSL, .Net framework, EJB (Enterprise Java Beans), Job schedules (e.g. Autosys, Control-M, Cron), JCL, Cobol II, DB2, CICS, Fortran, C++, C, Visual Basic, and I could go on an on.