Yes, a lender can make changes to the data on the Appraisal Logging screen in FHA Connection (FHAC) up until the case is endorsed.
Once the case is endorsed, no changes can be made by the lender. After endorsement, changes can only be made by the Homeownership Center (HOC).
The FHA Connection Guide is available at https://entp.hud.gov/idapp/html/mrtg-pkg.cfm
For additional information regarding the EAD portal, including fact sheets and user guides, please visit the Electronic Appraisal Delivery (EAD) Portal web page at https://www.hud.gov/program_offices/housing/sfh/lender/origination/ead