inapalserrano

I am working on affinity publisher and it doesn´t let me use the apostrophes. I do not know why is so since two hours ago I could use them ( I am writing in Spanish, a language full of "tildes"). Besides, when I am inside a text frame, if I push the "delete" key, the whole text frame disappears, not just the character. I do not know the reason. May be I have changed something without noticing, but it is driving me crazy. Some help, please?