Can I get directly to a link to efile? No.
To file an amended tax return using TurboTax you would have to exactly recreate the federal tax return that was filed. Then in the File section of the program you select the option to print the tax return, NOT e-file.
After the federal return was completed, then you can amend the tax return.
See this TurboTax support FAQ for amending a 2019 tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577
