How do I create a user-input column in SSRS?

I am new to SQL Server Reporting Services and report designing; can anyone help me in this? I have two questions: 1. How can I create a column for users to input data? After that, I need to perform some operations on the data entered by the user, which I need to display in another column. 2. How can I round a decimal to the nearest integer? For example, 6.03 to 6 and 6.52 to 7.