Can I add form NR4 in this website?

You can add the information from the Form NR4 into the United States TurboTax according the code that is shown on the statement.

For example, if there is a code 61, then the amount is for interest income. You will: 

• Type "1099-INT" in Search or Find
• Select the Jump to 1099-int link
• Navigate through the Form 1099-INT prompts to add your NR4, interest income.

You should convert the Canadian funds to US dollars before entering into TurboTax. 

You will use the Search/Find feature for the topic that relates to the NR4 code.

This is a little broad, as there are 66 possibilities for income type.

What about for income type 26? It's not going to be a 1099-INT. 

It is for a Canadian Pension and the tax withheld

See this TurboTax article for complete information: How do I enter my Canadian Pension Plan (CPP) or O ...

@hmstep

Distribution of RRIF

You can enter the Canadian Pension information as follows:  

1. Choose Federal on the left-hand side of your screen in the black.
2. Choose Income & Expenses from the menu at the top
3. Scroll down to Retirement Plans and Social Security
4. Click on Show more
5. Click on Show more for Canadian Registered Pension Income.