You have downloaded the W4 form from here.
You are trying to add a Date at the bottom of first page just above the label '10 Employer Identification Number (EIN)'
If you check this 'Employee's Signature & Date' both labels do show a colored box next to them. Which states that these 2 are not form fields.
Even if you would like to Sign and add date here using Acrobat Reader DC.
Then open the file in the Reader DC app. Click on 'Comment' tool from the set on the right.
This will list all the comments tool on the top of the document. From here select 'Text Comment' tool as highlight below.
After selecting this tool you can add the date.
Once that is done close the comment tool and click on Fill & Sign.
From here you can sign the document.
Let me know if this works for you.
Unfortunately, when you save the document, the comment is hidden. How do you add text that is readable as a sendable file?
I going on line to sign my w-4 2017 form I can't find it can you help me
I can't sign it on line
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An interactive or fillable form contains fields that you can select or fill in. For such forms, the Fill & Sign tool displays only the Sign option. For more information on filling an interactive form, see Fill in interactive forms
A flat form does not have interactive fields. It could be a paper form or PDF that hasn’t been optimized for form filling. However, you can use the Fill & Sign tools to add text and other symbols anywhere on the form. You can save frequently used information securely in your personal autofill collection. Next time, just drag and drop information to complete forms faster.
Sign your form by typing or drawing your signature, or using an image. Send your completed forms to others and store the forms securely in Adobe Document Cloud.
For more information: Fill and sign PDF forms using Adobe Acrobat Fill & Sign