Can not add new fields

[ArturoJGarciaJmz]

Trying to add new fields, but the name "remain" as text input, so  there isno way to use the field in new calculations

the run button, does not give any error, and the new field is added to the workflow, but does not appear for calculations

[Qiu]

@ArturoJGarciaJmz 
If you mean that the Newly added Field will not appear in the downsteam for processing, but it appeared after you run the workflow.
Then try to check if the option highlighted below is checked.

[ArturoJGarciaJmz]

Thanks  Qiu, but it is more like the new fields are with and X with black circle, like not way to do the "set the name" and enter

[ArturoJGarciaJmz]

I guess I found "my problem", I was doing a calculation over the same new field  I´m creating

[CoG]

Within the formula tool, the field naming text box will never change (so that you can change the name if you so desire later), but the field should still be able to be used in future calculations, even in the same formula tool. Here is a sample I have done to showcase this feature: