How to make an activity to open a url

Hello! I dont know much about coding so i decided to buy an app about quotes. The thing is i have opened it in android studio and want to make some changes. Specifically i want i want to change the button ''authors'' and instead of opening an activity i want to open a web link. How i am supposed to do that?
I hope this bit of code helps :

I think the button i want to change is this in the android manifest
<activity
android:name="com.axdev.quotes.AuteursActivity"
android:label="@string/title_activity_auteurs"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>

<!-- Points to searchable activity -->
<meta-data android:name="android.app.default_searchable"
android:value=".AuteursActivity" />

<!-- Points to searchable meta data -->
<meta-data android:name="android.app.searchable"
android:resource="@xml/searchable"/>
</activity>

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