Where did you (e.g., specific forum, developer site)?

Only install APK files from trusted sources. Re-signed APKs can potentially be modified to include malicious code [1].

This guide explains what is, its likely purpose within Android customization, and how to use it safely. What is taptotranslate161_signapk ?

When an application is modified (such as adding new features, patching, or reformatting), its original signature becomes invalid. Using signapk allows you to: Android requires all apps to be signed.

If the file is on your computer, connect your phone via USB and copy the APK file to your device's internal storage. Install the APK: Open a File Manager app on your Android device. Locate the taptotranslate161_signapk.apk file.

Once installed, open the app to use the translation features. Important Considerations and Safety Tips

A functionality often used to instantly translate text on screen, likely a modified version of a translation app [1].