If the information you need is in the public domain, such as an open data set published on the Open Data Portal, then accessing it should be a straightforward exercise. Remember though, some types of information in the public domain are subject to licensing or copyright restrictions, which can define limitations on use, reuse and on-sharing. Ensure you understand any licensing restrictions prior to use.
If the information you need is not available publicly, then getting access will require a few more steps.
Useful resources: