National Urban League president Vernon Jordan said today he had been personally assured by the director of the FBI that agents were doing all they could to bring his assailant to justice, and he was "confident" they would succeed.

The 44-year-old black leader, meeting reporters for the first time since he was shot in May in Fort Wayne, Ind., by a gunman who is still at large, did not theorize about who his assailant might have been, or the motives for the shooting. Nor did he discuss his thoughts as he lay recuperating.

"The pain was such, I was sufficiently sick, I was not figuring how it happened, but how to get through. . .," he said. His last memory prior to the shooting? "Walking." His description of the attack? "Indescribable."

Released only last week from the hospital, Jordan looked fit and healthy. "You can't tell I've lost 40 pounds because I'm wearing a tailored jacket," he told reporters, rising to show it and his streamlined figure.

But his tone at the Urban League press conference was noncommittal a far cry from the outspoken leader who once criticized Rev. Jesse Jackson for his approaches to the Palestine Liberation Organization, and who, in the past, attacked the Carter administration for "promises made and promises unkept."

He declined to say whom he would be voting for. He said, the Urban League, as a nonpartisan organization, would be endorsing no one. But he cautioned that "the black community enters the 1980s in a mood of anger and frustration."

Asked whether President Carter could count on support from the black community, he replied, "I'd say he can't count on it. . . In 1976, he was a new political figure and now he has a record to defend. . . But I think all of the candidates are in trouble. . . There's disillusionment across the nation. . . But I don't hold the candidates responsible, I hold the people responsible."