how to put amount for cell phone service?

Are you self-employed?   Preparing a Schedule C?   Why are you trying to enter your cell service?

I do self work with instacart.

If you have self-employment income for which you will pay self-employment tax for Social Security and Medicare,  you will need to use online Premium software or any version of the desktop software download so that you can prepare a Schedule C for your business expenses.

 

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/26653

 

https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-schedule-c/L5Fz3j5us_US_en_US?uid=m6a6gknk

 

https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employment-taxes/self-employed-expenses-deduct/L37ZS1B8T_US_en_US?uid=m6fntpg7

 

 

https://turbotax.intuit.com/tax-tips/self-employment-taxes/filing-taxes-for-on-demand-food-delivery-drivers/L7dIkSK6I