hi there – I haven’t seen or used any of these templates… but here are my suggestions –
If it is a text layer and you just can get the curser to select to correct layer in the composition window…. double click on the text layer in the timline and this will select all the text.
Maybe it is a solid with the basic text effect applied? If so, click on the layer, hit “e”, then go “edit text”
…… of course you could also check that the layer is not locked, or precomped….
hope this might have helped